| 1 | /* |
| 2 | * linux/fs/hfsplus/super.c |
| 3 | * |
| 4 | * Copyright (C) 2001 |
| 5 | * Brad Boyer (flar@allandria.com) |
| 6 | * (C) 2003 Ardis Technologies <roman@ardistech.com> |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/pagemap.h> |
| 13 | #include <linux/blkdev.h> |
| 14 | #include <linux/backing-dev.h> |
| 15 | #include <linux/fs.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/vfs.h> |
| 18 | #include <linux/nls.h> |
| 19 | |
| 20 | static struct inode *hfsplus_alloc_inode(struct super_block *sb); |
| 21 | static void hfsplus_destroy_inode(struct inode *inode); |
| 22 | |
| 23 | #include "hfsplus_fs.h" |
| 24 | #include "xattr.h" |
| 25 | |
| 26 | static int hfsplus_system_read_inode(struct inode *inode) |
| 27 | { |
| 28 | struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr; |
| 29 | |
| 30 | switch (inode->i_ino) { |
| 31 | case HFSPLUS_EXT_CNID: |
| 32 | hfsplus_inode_read_fork(inode, &vhdr->ext_file); |
| 33 | inode->i_mapping->a_ops = &hfsplus_btree_aops; |
| 34 | break; |
| 35 | case HFSPLUS_CAT_CNID: |
| 36 | hfsplus_inode_read_fork(inode, &vhdr->cat_file); |
| 37 | inode->i_mapping->a_ops = &hfsplus_btree_aops; |
| 38 | break; |
| 39 | case HFSPLUS_ALLOC_CNID: |
| 40 | hfsplus_inode_read_fork(inode, &vhdr->alloc_file); |
| 41 | inode->i_mapping->a_ops = &hfsplus_aops; |
| 42 | break; |
| 43 | case HFSPLUS_START_CNID: |
| 44 | hfsplus_inode_read_fork(inode, &vhdr->start_file); |
| 45 | break; |
| 46 | case HFSPLUS_ATTR_CNID: |
| 47 | hfsplus_inode_read_fork(inode, &vhdr->attr_file); |
| 48 | inode->i_mapping->a_ops = &hfsplus_btree_aops; |
| 49 | break; |
| 50 | default: |
| 51 | return -EIO; |
| 52 | } |
| 53 | |
| 54 | return 0; |
| 55 | } |
| 56 | |
| 57 | struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino) |
| 58 | { |
| 59 | struct hfs_find_data fd; |
| 60 | struct inode *inode; |
| 61 | int err; |
| 62 | |
| 63 | inode = iget_locked(sb, ino); |
| 64 | if (!inode) |
| 65 | return ERR_PTR(-ENOMEM); |
| 66 | if (!(inode->i_state & I_NEW)) |
| 67 | return inode; |
| 68 | |
| 69 | INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list); |
| 70 | mutex_init(&HFSPLUS_I(inode)->extents_lock); |
| 71 | HFSPLUS_I(inode)->flags = 0; |
| 72 | HFSPLUS_I(inode)->extent_state = 0; |
| 73 | HFSPLUS_I(inode)->rsrc_inode = NULL; |
| 74 | atomic_set(&HFSPLUS_I(inode)->opencnt, 0); |
| 75 | |
| 76 | if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || |
| 77 | inode->i_ino == HFSPLUS_ROOT_CNID) { |
| 78 | err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); |
| 79 | if (!err) { |
| 80 | err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); |
| 81 | if (!err) |
| 82 | err = hfsplus_cat_read_inode(inode, &fd); |
| 83 | hfs_find_exit(&fd); |
| 84 | } |
| 85 | } else { |
| 86 | err = hfsplus_system_read_inode(inode); |
| 87 | } |
| 88 | |
| 89 | if (err) { |
| 90 | iget_failed(inode); |
| 91 | return ERR_PTR(err); |
| 92 | } |
| 93 | |
| 94 | unlock_new_inode(inode); |
| 95 | return inode; |
| 96 | } |
| 97 | |
| 98 | static int hfsplus_system_write_inode(struct inode *inode) |
| 99 | { |
| 100 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); |
| 101 | struct hfsplus_vh *vhdr = sbi->s_vhdr; |
| 102 | struct hfsplus_fork_raw *fork; |
| 103 | struct hfs_btree *tree = NULL; |
| 104 | |
| 105 | switch (inode->i_ino) { |
| 106 | case HFSPLUS_EXT_CNID: |
| 107 | fork = &vhdr->ext_file; |
| 108 | tree = sbi->ext_tree; |
| 109 | break; |
| 110 | case HFSPLUS_CAT_CNID: |
| 111 | fork = &vhdr->cat_file; |
| 112 | tree = sbi->cat_tree; |
| 113 | break; |
| 114 | case HFSPLUS_ALLOC_CNID: |
| 115 | fork = &vhdr->alloc_file; |
| 116 | break; |
| 117 | case HFSPLUS_START_CNID: |
| 118 | fork = &vhdr->start_file; |
| 119 | break; |
| 120 | case HFSPLUS_ATTR_CNID: |
| 121 | fork = &vhdr->attr_file; |
| 122 | tree = sbi->attr_tree; |
| 123 | break; |
| 124 | default: |
| 125 | return -EIO; |
| 126 | } |
| 127 | |
| 128 | if (fork->total_size != cpu_to_be64(inode->i_size)) { |
| 129 | set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags); |
| 130 | hfsplus_mark_mdb_dirty(inode->i_sb); |
| 131 | } |
| 132 | hfsplus_inode_write_fork(inode, fork); |
| 133 | if (tree) { |
| 134 | int err = hfs_btree_write(tree); |
| 135 | |
| 136 | if (err) { |
| 137 | pr_err("b-tree write err: %d, ino %lu\n", |
| 138 | err, inode->i_ino); |
| 139 | return err; |
| 140 | } |
| 141 | } |
| 142 | return 0; |
| 143 | } |
| 144 | |
| 145 | static int hfsplus_write_inode(struct inode *inode, |
| 146 | struct writeback_control *wbc) |
| 147 | { |
| 148 | int err; |
| 149 | |
| 150 | hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino); |
| 151 | |
| 152 | err = hfsplus_ext_write_extent(inode); |
| 153 | if (err) |
| 154 | return err; |
| 155 | |
| 156 | if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || |
| 157 | inode->i_ino == HFSPLUS_ROOT_CNID) |
| 158 | return hfsplus_cat_write_inode(inode); |
| 159 | else |
| 160 | return hfsplus_system_write_inode(inode); |
| 161 | } |
| 162 | |
| 163 | static void hfsplus_evict_inode(struct inode *inode) |
| 164 | { |
| 165 | hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino); |
| 166 | truncate_inode_pages_final(&inode->i_data); |
| 167 | clear_inode(inode); |
| 168 | if (HFSPLUS_IS_RSRC(inode)) { |
| 169 | HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL; |
| 170 | iput(HFSPLUS_I(inode)->rsrc_inode); |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | static int hfsplus_sync_fs(struct super_block *sb, int wait) |
| 175 | { |
| 176 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); |
| 177 | struct hfsplus_vh *vhdr = sbi->s_vhdr; |
| 178 | int write_backup = 0; |
| 179 | int error, error2; |
| 180 | |
| 181 | if (!wait) |
| 182 | return 0; |
| 183 | |
| 184 | hfs_dbg(SUPER, "hfsplus_sync_fs\n"); |
| 185 | |
| 186 | /* |
| 187 | * Explicitly write out the special metadata inodes. |
| 188 | * |
| 189 | * While these special inodes are marked as hashed and written |
| 190 | * out peridocically by the flusher threads we redirty them |
| 191 | * during writeout of normal inodes, and thus the life lock |
| 192 | * prevents us from getting the latest state to disk. |
| 193 | */ |
| 194 | error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); |
| 195 | error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); |
| 196 | if (!error) |
| 197 | error = error2; |
| 198 | if (sbi->attr_tree) { |
| 199 | error2 = |
| 200 | filemap_write_and_wait(sbi->attr_tree->inode->i_mapping); |
| 201 | if (!error) |
| 202 | error = error2; |
| 203 | } |
| 204 | error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); |
| 205 | if (!error) |
| 206 | error = error2; |
| 207 | |
| 208 | mutex_lock(&sbi->vh_mutex); |
| 209 | mutex_lock(&sbi->alloc_mutex); |
| 210 | vhdr->free_blocks = cpu_to_be32(sbi->free_blocks); |
| 211 | vhdr->next_cnid = cpu_to_be32(sbi->next_cnid); |
| 212 | vhdr->folder_count = cpu_to_be32(sbi->folder_count); |
| 213 | vhdr->file_count = cpu_to_be32(sbi->file_count); |
| 214 | |
| 215 | if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) { |
| 216 | memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr)); |
| 217 | write_backup = 1; |
| 218 | } |
| 219 | |
| 220 | error2 = hfsplus_submit_bio(sb, |
| 221 | sbi->part_start + HFSPLUS_VOLHEAD_SECTOR, |
| 222 | sbi->s_vhdr_buf, NULL, WRITE_SYNC); |
| 223 | if (!error) |
| 224 | error = error2; |
| 225 | if (!write_backup) |
| 226 | goto out; |
| 227 | |
| 228 | error2 = hfsplus_submit_bio(sb, |
| 229 | sbi->part_start + sbi->sect_count - 2, |
| 230 | sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC); |
| 231 | if (!error) |
| 232 | error2 = error; |
| 233 | out: |
| 234 | mutex_unlock(&sbi->alloc_mutex); |
| 235 | mutex_unlock(&sbi->vh_mutex); |
| 236 | |
| 237 | if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) |
| 238 | blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL); |
| 239 | |
| 240 | return error; |
| 241 | } |
| 242 | |
| 243 | static void delayed_sync_fs(struct work_struct *work) |
| 244 | { |
| 245 | int err; |
| 246 | struct hfsplus_sb_info *sbi; |
| 247 | |
| 248 | sbi = container_of(work, struct hfsplus_sb_info, sync_work.work); |
| 249 | |
| 250 | spin_lock(&sbi->work_lock); |
| 251 | sbi->work_queued = 0; |
| 252 | spin_unlock(&sbi->work_lock); |
| 253 | |
| 254 | err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1); |
| 255 | if (err) |
| 256 | pr_err("delayed sync fs err %d\n", err); |
| 257 | } |
| 258 | |
| 259 | void hfsplus_mark_mdb_dirty(struct super_block *sb) |
| 260 | { |
| 261 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); |
| 262 | unsigned long delay; |
| 263 | |
| 264 | if (sb->s_flags & MS_RDONLY) |
| 265 | return; |
| 266 | |
| 267 | spin_lock(&sbi->work_lock); |
| 268 | if (!sbi->work_queued) { |
| 269 | delay = msecs_to_jiffies(dirty_writeback_interval * 10); |
| 270 | queue_delayed_work(system_long_wq, &sbi->sync_work, delay); |
| 271 | sbi->work_queued = 1; |
| 272 | } |
| 273 | spin_unlock(&sbi->work_lock); |
| 274 | } |
| 275 | |
| 276 | static void hfsplus_put_super(struct super_block *sb) |
| 277 | { |
| 278 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); |
| 279 | |
| 280 | hfs_dbg(SUPER, "hfsplus_put_super\n"); |
| 281 | |
| 282 | cancel_delayed_work_sync(&sbi->sync_work); |
| 283 | |
| 284 | if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) { |
| 285 | struct hfsplus_vh *vhdr = sbi->s_vhdr; |
| 286 | |
| 287 | vhdr->modify_date = hfsp_now2mt(); |
| 288 | vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); |
| 289 | vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); |
| 290 | |
| 291 | hfsplus_sync_fs(sb, 1); |
| 292 | } |
| 293 | |
| 294 | hfs_btree_close(sbi->attr_tree); |
| 295 | hfs_btree_close(sbi->cat_tree); |
| 296 | hfs_btree_close(sbi->ext_tree); |
| 297 | iput(sbi->alloc_file); |
| 298 | iput(sbi->hidden_dir); |
| 299 | kfree(sbi->s_vhdr_buf); |
| 300 | kfree(sbi->s_backup_vhdr_buf); |
| 301 | unload_nls(sbi->nls); |
| 302 | kfree(sb->s_fs_info); |
| 303 | sb->s_fs_info = NULL; |
| 304 | } |
| 305 | |
| 306 | static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 307 | { |
| 308 | struct super_block *sb = dentry->d_sb; |
| 309 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); |
| 310 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
| 311 | |
| 312 | buf->f_type = HFSPLUS_SUPER_MAGIC; |
| 313 | buf->f_bsize = sb->s_blocksize; |
| 314 | buf->f_blocks = sbi->total_blocks << sbi->fs_shift; |
| 315 | buf->f_bfree = sbi->free_blocks << sbi->fs_shift; |
| 316 | buf->f_bavail = buf->f_bfree; |
| 317 | buf->f_files = 0xFFFFFFFF; |
| 318 | buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid; |
| 319 | buf->f_fsid.val[0] = (u32)id; |
| 320 | buf->f_fsid.val[1] = (u32)(id >> 32); |
| 321 | buf->f_namelen = HFSPLUS_MAX_STRLEN; |
| 322 | |
| 323 | return 0; |
| 324 | } |
| 325 | |
| 326 | static int hfsplus_remount(struct super_block *sb, int *flags, char *data) |
| 327 | { |
| 328 | sync_filesystem(sb); |
| 329 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 330 | return 0; |
| 331 | if (!(*flags & MS_RDONLY)) { |
| 332 | struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr; |
| 333 | int force = 0; |
| 334 | |
| 335 | if (!hfsplus_parse_options_remount(data, &force)) |
| 336 | return -EINVAL; |
| 337 | |
| 338 | if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { |
| 339 | pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. leaving read-only.\n"); |
| 340 | sb->s_flags |= MS_RDONLY; |
| 341 | *flags |= MS_RDONLY; |
| 342 | } else if (force) { |
| 343 | /* nothing */ |
| 344 | } else if (vhdr->attributes & |
| 345 | cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { |
| 346 | pr_warn("filesystem is marked locked, leaving read-only.\n"); |
| 347 | sb->s_flags |= MS_RDONLY; |
| 348 | *flags |= MS_RDONLY; |
| 349 | } else if (vhdr->attributes & |
| 350 | cpu_to_be32(HFSPLUS_VOL_JOURNALED)) { |
| 351 | pr_warn("filesystem is marked journaled, leaving read-only.\n"); |
| 352 | sb->s_flags |= MS_RDONLY; |
| 353 | *flags |= MS_RDONLY; |
| 354 | } |
| 355 | } |
| 356 | return 0; |
| 357 | } |
| 358 | |
| 359 | static const struct super_operations hfsplus_sops = { |
| 360 | .alloc_inode = hfsplus_alloc_inode, |
| 361 | .destroy_inode = hfsplus_destroy_inode, |
| 362 | .write_inode = hfsplus_write_inode, |
| 363 | .evict_inode = hfsplus_evict_inode, |
| 364 | .put_super = hfsplus_put_super, |
| 365 | .sync_fs = hfsplus_sync_fs, |
| 366 | .statfs = hfsplus_statfs, |
| 367 | .remount_fs = hfsplus_remount, |
| 368 | .show_options = hfsplus_show_options, |
| 369 | }; |
| 370 | |
| 371 | static int hfsplus_fill_super(struct super_block *sb, void *data, int silent) |
| 372 | { |
| 373 | struct hfsplus_vh *vhdr; |
| 374 | struct hfsplus_sb_info *sbi; |
| 375 | hfsplus_cat_entry entry; |
| 376 | struct hfs_find_data fd; |
| 377 | struct inode *root, *inode; |
| 378 | struct qstr str; |
| 379 | struct nls_table *nls = NULL; |
| 380 | u64 last_fs_block, last_fs_page; |
| 381 | int err; |
| 382 | |
| 383 | err = -ENOMEM; |
| 384 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
| 385 | if (!sbi) |
| 386 | goto out; |
| 387 | |
| 388 | sb->s_fs_info = sbi; |
| 389 | mutex_init(&sbi->alloc_mutex); |
| 390 | mutex_init(&sbi->vh_mutex); |
| 391 | spin_lock_init(&sbi->work_lock); |
| 392 | INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs); |
| 393 | hfsplus_fill_defaults(sbi); |
| 394 | |
| 395 | err = -EINVAL; |
| 396 | if (!hfsplus_parse_options(data, sbi)) { |
| 397 | pr_err("unable to parse mount options\n"); |
| 398 | goto out_unload_nls; |
| 399 | } |
| 400 | |
| 401 | /* temporarily use utf8 to correctly find the hidden dir below */ |
| 402 | nls = sbi->nls; |
| 403 | sbi->nls = load_nls("utf8"); |
| 404 | if (!sbi->nls) { |
| 405 | pr_err("unable to load nls for utf8\n"); |
| 406 | goto out_unload_nls; |
| 407 | } |
| 408 | |
| 409 | /* Grab the volume header */ |
| 410 | if (hfsplus_read_wrapper(sb)) { |
| 411 | if (!silent) |
| 412 | pr_warn("unable to find HFS+ superblock\n"); |
| 413 | goto out_unload_nls; |
| 414 | } |
| 415 | vhdr = sbi->s_vhdr; |
| 416 | |
| 417 | /* Copy parts of the volume header into the superblock */ |
| 418 | sb->s_magic = HFSPLUS_VOLHEAD_SIG; |
| 419 | if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION || |
| 420 | be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) { |
| 421 | pr_err("wrong filesystem version\n"); |
| 422 | goto out_free_vhdr; |
| 423 | } |
| 424 | sbi->total_blocks = be32_to_cpu(vhdr->total_blocks); |
| 425 | sbi->free_blocks = be32_to_cpu(vhdr->free_blocks); |
| 426 | sbi->next_cnid = be32_to_cpu(vhdr->next_cnid); |
| 427 | sbi->file_count = be32_to_cpu(vhdr->file_count); |
| 428 | sbi->folder_count = be32_to_cpu(vhdr->folder_count); |
| 429 | sbi->data_clump_blocks = |
| 430 | be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift; |
| 431 | if (!sbi->data_clump_blocks) |
| 432 | sbi->data_clump_blocks = 1; |
| 433 | sbi->rsrc_clump_blocks = |
| 434 | be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift; |
| 435 | if (!sbi->rsrc_clump_blocks) |
| 436 | sbi->rsrc_clump_blocks = 1; |
| 437 | |
| 438 | err = -EFBIG; |
| 439 | last_fs_block = sbi->total_blocks - 1; |
| 440 | last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >> |
| 441 | PAGE_CACHE_SHIFT; |
| 442 | |
| 443 | if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) || |
| 444 | (last_fs_page > (pgoff_t)(~0ULL))) { |
| 445 | pr_err("filesystem size too large\n"); |
| 446 | goto out_free_vhdr; |
| 447 | } |
| 448 | |
| 449 | /* Set up operations so we can load metadata */ |
| 450 | sb->s_op = &hfsplus_sops; |
| 451 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
| 452 | |
| 453 | if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { |
| 454 | pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. mounting read-only.\n"); |
| 455 | sb->s_flags |= MS_RDONLY; |
| 456 | } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) { |
| 457 | /* nothing */ |
| 458 | } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { |
| 459 | pr_warn("Filesystem is marked locked, mounting read-only.\n"); |
| 460 | sb->s_flags |= MS_RDONLY; |
| 461 | } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && |
| 462 | !(sb->s_flags & MS_RDONLY)) { |
| 463 | pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n"); |
| 464 | sb->s_flags |= MS_RDONLY; |
| 465 | } |
| 466 | |
| 467 | err = -EINVAL; |
| 468 | |
| 469 | /* Load metadata objects (B*Trees) */ |
| 470 | sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); |
| 471 | if (!sbi->ext_tree) { |
| 472 | pr_err("failed to load extents file\n"); |
| 473 | goto out_free_vhdr; |
| 474 | } |
| 475 | sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID); |
| 476 | if (!sbi->cat_tree) { |
| 477 | pr_err("failed to load catalog file\n"); |
| 478 | goto out_close_ext_tree; |
| 479 | } |
| 480 | atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE); |
| 481 | if (vhdr->attr_file.total_blocks != 0) { |
| 482 | sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID); |
| 483 | if (!sbi->attr_tree) { |
| 484 | pr_err("failed to load attributes file\n"); |
| 485 | goto out_close_cat_tree; |
| 486 | } |
| 487 | atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE); |
| 488 | } |
| 489 | sb->s_xattr = hfsplus_xattr_handlers; |
| 490 | |
| 491 | inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID); |
| 492 | if (IS_ERR(inode)) { |
| 493 | pr_err("failed to load allocation file\n"); |
| 494 | err = PTR_ERR(inode); |
| 495 | goto out_close_attr_tree; |
| 496 | } |
| 497 | sbi->alloc_file = inode; |
| 498 | |
| 499 | /* Load the root directory */ |
| 500 | root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID); |
| 501 | if (IS_ERR(root)) { |
| 502 | pr_err("failed to load root directory\n"); |
| 503 | err = PTR_ERR(root); |
| 504 | goto out_put_alloc_file; |
| 505 | } |
| 506 | |
| 507 | sb->s_d_op = &hfsplus_dentry_operations; |
| 508 | sb->s_root = d_make_root(root); |
| 509 | if (!sb->s_root) { |
| 510 | err = -ENOMEM; |
| 511 | goto out_put_alloc_file; |
| 512 | } |
| 513 | |
| 514 | str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; |
| 515 | str.name = HFSP_HIDDENDIR_NAME; |
| 516 | err = hfs_find_init(sbi->cat_tree, &fd); |
| 517 | if (err) |
| 518 | goto out_put_root; |
| 519 | err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str); |
| 520 | if (unlikely(err < 0)) |
| 521 | goto out_put_root; |
| 522 | if (!hfs_brec_read(&fd, &entry, sizeof(entry))) { |
| 523 | hfs_find_exit(&fd); |
| 524 | if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) |
| 525 | goto out_put_root; |
| 526 | inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id)); |
| 527 | if (IS_ERR(inode)) { |
| 528 | err = PTR_ERR(inode); |
| 529 | goto out_put_root; |
| 530 | } |
| 531 | sbi->hidden_dir = inode; |
| 532 | } else |
| 533 | hfs_find_exit(&fd); |
| 534 | |
| 535 | if (!(sb->s_flags & MS_RDONLY)) { |
| 536 | /* |
| 537 | * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused |
| 538 | * all three are registered with Apple for our use |
| 539 | */ |
| 540 | vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); |
| 541 | vhdr->modify_date = hfsp_now2mt(); |
| 542 | be32_add_cpu(&vhdr->write_count, 1); |
| 543 | vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); |
| 544 | vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); |
| 545 | hfsplus_sync_fs(sb, 1); |
| 546 | |
| 547 | if (!sbi->hidden_dir) { |
| 548 | mutex_lock(&sbi->vh_mutex); |
| 549 | sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR); |
| 550 | if (!sbi->hidden_dir) { |
| 551 | mutex_unlock(&sbi->vh_mutex); |
| 552 | err = -ENOMEM; |
| 553 | goto out_put_root; |
| 554 | } |
| 555 | err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root, |
| 556 | &str, sbi->hidden_dir); |
| 557 | if (err) { |
| 558 | mutex_unlock(&sbi->vh_mutex); |
| 559 | goto out_put_hidden_dir; |
| 560 | } |
| 561 | |
| 562 | err = hfsplus_init_inode_security(sbi->hidden_dir, |
| 563 | root, &str); |
| 564 | if (err == -EOPNOTSUPP) |
| 565 | err = 0; /* Operation is not supported. */ |
| 566 | else if (err) { |
| 567 | /* |
| 568 | * Try to delete anyway without |
| 569 | * error analysis. |
| 570 | */ |
| 571 | hfsplus_delete_cat(sbi->hidden_dir->i_ino, |
| 572 | root, &str); |
| 573 | mutex_unlock(&sbi->vh_mutex); |
| 574 | goto out_put_hidden_dir; |
| 575 | } |
| 576 | |
| 577 | mutex_unlock(&sbi->vh_mutex); |
| 578 | hfsplus_mark_inode_dirty(sbi->hidden_dir, |
| 579 | HFSPLUS_I_CAT_DIRTY); |
| 580 | } |
| 581 | } |
| 582 | |
| 583 | unload_nls(sbi->nls); |
| 584 | sbi->nls = nls; |
| 585 | return 0; |
| 586 | |
| 587 | out_put_hidden_dir: |
| 588 | iput(sbi->hidden_dir); |
| 589 | out_put_root: |
| 590 | dput(sb->s_root); |
| 591 | sb->s_root = NULL; |
| 592 | out_put_alloc_file: |
| 593 | iput(sbi->alloc_file); |
| 594 | out_close_attr_tree: |
| 595 | hfs_btree_close(sbi->attr_tree); |
| 596 | out_close_cat_tree: |
| 597 | hfs_btree_close(sbi->cat_tree); |
| 598 | out_close_ext_tree: |
| 599 | hfs_btree_close(sbi->ext_tree); |
| 600 | out_free_vhdr: |
| 601 | kfree(sbi->s_vhdr_buf); |
| 602 | kfree(sbi->s_backup_vhdr_buf); |
| 603 | out_unload_nls: |
| 604 | unload_nls(sbi->nls); |
| 605 | unload_nls(nls); |
| 606 | kfree(sbi); |
| 607 | out: |
| 608 | return err; |
| 609 | } |
| 610 | |
| 611 | MODULE_AUTHOR("Brad Boyer"); |
| 612 | MODULE_DESCRIPTION("Extended Macintosh Filesystem"); |
| 613 | MODULE_LICENSE("GPL"); |
| 614 | |
| 615 | static struct kmem_cache *hfsplus_inode_cachep; |
| 616 | |
| 617 | static struct inode *hfsplus_alloc_inode(struct super_block *sb) |
| 618 | { |
| 619 | struct hfsplus_inode_info *i; |
| 620 | |
| 621 | i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL); |
| 622 | return i ? &i->vfs_inode : NULL; |
| 623 | } |
| 624 | |
| 625 | static void hfsplus_i_callback(struct rcu_head *head) |
| 626 | { |
| 627 | struct inode *inode = container_of(head, struct inode, i_rcu); |
| 628 | |
| 629 | kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode)); |
| 630 | } |
| 631 | |
| 632 | static void hfsplus_destroy_inode(struct inode *inode) |
| 633 | { |
| 634 | call_rcu(&inode->i_rcu, hfsplus_i_callback); |
| 635 | } |
| 636 | |
| 637 | #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) |
| 638 | |
| 639 | static struct dentry *hfsplus_mount(struct file_system_type *fs_type, |
| 640 | int flags, const char *dev_name, void *data) |
| 641 | { |
| 642 | return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super); |
| 643 | } |
| 644 | |
| 645 | static struct file_system_type hfsplus_fs_type = { |
| 646 | .owner = THIS_MODULE, |
| 647 | .name = "hfsplus", |
| 648 | .mount = hfsplus_mount, |
| 649 | .kill_sb = kill_block_super, |
| 650 | .fs_flags = FS_REQUIRES_DEV, |
| 651 | }; |
| 652 | MODULE_ALIAS_FS("hfsplus"); |
| 653 | |
| 654 | static void hfsplus_init_once(void *p) |
| 655 | { |
| 656 | struct hfsplus_inode_info *i = p; |
| 657 | |
| 658 | inode_init_once(&i->vfs_inode); |
| 659 | } |
| 660 | |
| 661 | static int __init init_hfsplus_fs(void) |
| 662 | { |
| 663 | int err; |
| 664 | |
| 665 | hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", |
| 666 | HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, |
| 667 | hfsplus_init_once); |
| 668 | if (!hfsplus_inode_cachep) |
| 669 | return -ENOMEM; |
| 670 | err = hfsplus_create_attr_tree_cache(); |
| 671 | if (err) |
| 672 | goto destroy_inode_cache; |
| 673 | err = register_filesystem(&hfsplus_fs_type); |
| 674 | if (err) |
| 675 | goto destroy_attr_tree_cache; |
| 676 | return 0; |
| 677 | |
| 678 | destroy_attr_tree_cache: |
| 679 | hfsplus_destroy_attr_tree_cache(); |
| 680 | |
| 681 | destroy_inode_cache: |
| 682 | kmem_cache_destroy(hfsplus_inode_cachep); |
| 683 | |
| 684 | return err; |
| 685 | } |
| 686 | |
| 687 | static void __exit exit_hfsplus_fs(void) |
| 688 | { |
| 689 | unregister_filesystem(&hfsplus_fs_type); |
| 690 | |
| 691 | /* |
| 692 | * Make sure all delayed rcu free inodes are flushed before we |
| 693 | * destroy cache. |
| 694 | */ |
| 695 | rcu_barrier(); |
| 696 | hfsplus_destroy_attr_tree_cache(); |
| 697 | kmem_cache_destroy(hfsplus_inode_cachep); |
| 698 | } |
| 699 | |
| 700 | module_init(init_hfsplus_fs) |
| 701 | module_exit(exit_hfsplus_fs) |